Exhaust system for an internal combustion engine

Abstract

In an exhaust system for an internal combustion engine, having an exhaust manifold including an inner shell and an outer shell partially surrounding the inner shell, so that the space between the shells forms an insulating volume, an exhaust gas recirculation line is connected to the outer shell of the exhaust manifold for removal of exhaust gas for its recirculating from the space between the inner and outer shells. The invention is also directed to a method for recirculating exhaust gas.

What is claimed is:  
     
       1. An exhaust system for an internal combustion engine having an exhaust manifold including an inner shell and an outer shell partially surrounding the inner shell in spaced relationship, the space between said shells forming an insulating volume, said inner shell having entry areas and being supported such that said entry areas are disposed adjacent said engine in spaced relationship therefrom so as to permit exhaust gas from said engine to enter said outer shell while said inner shell is freely expandable relative to said engine and said outer shell, and an exhaust gas recirculation line connected to said exhaust manifold, said outer shell including a connection stub arranged near the downstream end of said outer shell with respect to the exhaust gas stream in the exhaust manifold for removing exhaust gas from said space between said inner and outer shells for recirculating said exhaust gas through said recirculation line to the engine. 
     
     
       2. An exhaust system according to  claim 1 , wherein said connection stub and said outer shell are formed integrally.